Liu Zhou, Lin Renxing, Wei Mingyang, Yin Mengran, Wu Pu, Li Manya, Li Ludong, Wang Yurui, Chen Gang, Carnevali Virginia, Agosta Lorenzo, Slama Vladislav, Lempesis Nikolaos, Wang Zhichao, Wang Meiyu, Deng Yu, Luo Haowen, Gao Han, Rothlisberger Ursula, Zakeeruddin Shaik M, Luo Xin, Liu Ye, Grätzel Michael, Tan Hairen
National Laboratory of Solid State Microstructures, Collaborative Innovation Center of Advanced Microstructures, College of Engineering and Applied Sciences, Frontiers Science Center for Critical Earth Material Cycling, Nanjing University, Nanjing, China.
Laboratory of Photonics and Interfaces, Ecole Polytechnique Fédérale de Lausanne, Lausanne, Switzerland.
Nat Mater. 2025 Feb;24(2):252-259. doi: 10.1038/s41563-024-02073-x. Epub 2025 Jan 10.
Monolithic all-perovskite tandem solar cells present a promising approach for exceeding the efficiency limit of single-junction solar cells. However, the substantial open-circuit voltage loss in the wide-bandgap perovskite subcell hinders further improvements in power-conversion efficiency. Here we develop wide-bandgap perovskite films with improved (100) crystal orientation that suppress non-radiative recombination. We show that using two-dimensional perovskite as an intermediate phase on the film surface promotes heterogeneous nucleation along the (100) three-dimensional perovskite facets during crystallization. Preferred (100) orientations can be realized by augmenting the quantity of two-dimensional phases through surface composition engineering, without the need for excessive two-dimensional ligands that otherwise impede carrier transport. We demonstrate an open-circuit voltage of 1.373 V for 1.78 eV wide-bandgap perovskite solar cells, along with a high fill factor of 84.7%. This yields an open-circuit voltage of 2.21 V and a certified power-conversion efficiency of 29.1% for all-perovskite tandem solar cells, measured under the maximum power-point conditions.
单片全钙钛矿串联太阳能电池为突破单结太阳能电池的效率极限提供了一种很有前景的方法。然而，宽带隙钙钛矿子电池中存在的大量开路电压损失阻碍了功率转换效率的进一步提高。在此，我们制备了具有改进的(100)晶体取向的宽带隙钙钛矿薄膜，该取向可抑制非辐射复合。我们表明，在薄膜表面使用二维钙钛矿作为中间相可促进结晶过程中沿(100)三维钙钛矿晶面的异质成核。通过表面组成工程增加二维相的数量，无需过多阻碍载流子传输的二维配体，即可实现优选的(100)取向。我们展示了1.78 eV宽带隙钙钛矿太阳能电池的开路电压为1.373 V，填充因子高达84.7%。在最大功率点条件下测量，全钙钛矿串联太阳能电池的开路电压为2.21 V，认证功率转换效率为29.1%。
